Burgers vs. pizza -- McDonald's (MCD) is betting its Big Macs will win. The world's largest burger chain said it will open more than 100 new restaurants in Italy by 2015. McDonald's plans to spend $457 million in the recession-battered country, and hire 3,000 more employees in the expansion. McDonald's shares fell 0.1% in Wednesday afternoon trading. It's a calculated risk. Italy's economy has been depressed since 2011 and foreign investment in the